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From "Andreas Calvo (JIRA)" <j...@apache.org>
Subject [jira] [Comment Edited] (AMQ-3353) Durable subscribers on durable topics don't receive messages after network disconnect
Date Mon, 25 Feb 2013 22:34:14 GMT

    [ https://issues.apache.org/jira/browse/AMQ-3353?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13586381#comment-13586381
] 

Andreas Calvo edited comment on AMQ-3353 at 2/25/13 10:32 PM:
--------------------------------------------------------------

[~gtully],
Thanks for the quick reply.
However, although when I made the test it failed (and now it doesn't), I don't think it captures
truly the situation.
Using a proxy can throw the Inactivity Monitor (even if it's paused or closed), but it does
not capture an abrupt stop of the broker or it's connections.
While doing more tests in the lab, throwing a socket disconnect error (that means, unplugging
the network cable) seems to, as [~noelady] expressed, leave the durable subscribers in a zombie
state: they seem to exists and receive packages, but aren't able to dequeue anything.
This fails as of ActiveMQ 5.7, haven't tested yet on 5.8.

If there is any way to cause a socket disconnect error programmatically, it may give us a
hint.

I may note that, while using ActiveMQ the results are really bad, using fuse-09-16 seems to
give better results.

Thanks!
                
      was (Author: acalvo):
    [~gtully]
Thanks for the quick reply.
However, although when I made the test it failed (and now it doesn't), I don't think it captures
truly the situation.
Using a proxy can throw the Inactivity Monitor (even if it's paused or closed), but it does
not capture an abrupt stop of the broker or it's connections.
While doing more tests in the lab, throwing a socket disconnect error (that means, unplugging
the network cable) seems to, as [~noelady] expressed, leave the durable subscribers in a zombie
state: they seem to exists and receive packages, but aren't able to dequeue anything.

If there is any way to cause a socket disconnect error programmatically, it may give us a
hint.

I may note that, while using ActiveMQ the results are really bad, using fuse-09-16 seems to
give better results.

Thanks!
                  
> Durable subscribers on durable topics don't receive messages after network disconnect
> -------------------------------------------------------------------------------------
>
>                 Key: AMQ-3353
>                 URL: https://issues.apache.org/jira/browse/AMQ-3353
>             Project: ActiveMQ
>          Issue Type: Bug
>          Components: Broker
>    Affects Versions: 5.3.1, 5.5.0
>         Environment: Windows & Linux
> JDK 1.6
>            Reporter: Syed Faraz Ali
>            Assignee: Gary Tully
>             Fix For: 5.6.0
>
>         Attachments: DurableSubscriberWithNetworkDisconnectTest.java, DurableSubscriberWithNetworkDisconnectTest.java,
DurableSubscriberWithNetworkDisconnectTest.java, embedded1.xml, embedded2.xml, example.tar.gz,
instructions.txt, standalone1.xml, standalone2.xml, TEST-org.apache.activemq.usecases.DurableSubscriberWithNetworkDisconnectTest.xml,
TEST-org.apache.activemq.usecases.DurableSubscriberWithNetworkDisconnectTest.xml, test-results.ods
>
>
> I've set up a durable topic with the default (persistent) delivery mode on one machine
that is publishing a simple text message every 5 seconds. I created a durable subscriber that
consumes messages published to the above topic on another machine. I am using broker to broker
communication between the two machines.
> I start up the two programs on either machine and see the messages coming through to
the subscriber. If I then pull the network cable to disconnect the network between the two
machines, wait for a minute and then plug it back in, my subscriber doesn't receive the messages
any more. I can see from the output that the publisher is still publishing them (Temporary
topics, non-durable queues all continue to sync up in our production environment, it is only
the durable topics that don't work after network reconnect)
> If I were to tweak a setting on the publisher's broker (that was introduced only in 5.5.0),
suppressDuplicateTopicSubscriptions=false, then the topics work correctly after network reconnect.
But this may have other unintended consequences and I was hoping to get a better idea of:
> - is this a known issue ? if so, then are there any specific challenges that have caused
it not to be fixed?
> - are other people out there using durable topics and subscribers without a failover
option that have run into this problem? What have they done to work around?
> Here is how my subscriber and publisher are set up:
> Topic Publisher (Machine 1)
>         publisherConnection = connFactory.createConnection();
>         publisherConnection.setClientID( "ProducerCliID" );
>         publisherConnection.start();
>         session = publisherConnection.createSession( true, -1 );
>         Destination producerTopic = session.createTopic( TEST_TOPIC_NAME );
>         producer = session.createProducer( (Topic)producerTopic );
> ....
> ....
> ....
>     // On a timer, keep sending this out every 5 seconds
>                  String text = "HELLO " + count++;
>                 TextMessage msg = session.createTextMessage( text );
>                 System.out.println( "Sending TextMessage = " + msg.getText() );
>                 producer.send( msg );
>                 session.commit();
> Subscriber ( Machine 2):
>         Connection clientConnection = connFactory.createConnection();
>         clientConnection.setClientID("cliID");
>         clientConnection.start();
>         Session session = clientConnection.createSession( false, Session.AUTO_ACKNOWLEDGE
);
>         Destination topic = session.createTopic( topicName );
>         MessageConsumer subscriber = session.createDurableSubscriber( (Topic)topic, "subName"
);
>         TestMessageListener msgListener = new TestMessageListener( 1000 );
>         subscriber.setMessageListener( msgListener );
> .....
> .....
>          // TestMessageListener's onMessage method simply outputs the message:
>         public void onMessage(Message message)
>         {
>             if ( message instanceof TextMessage )
>             {
>                 System.out.println( "Message received = " + ((TextMessage)message) );
>             }
>         }
> I can provide the jars for you to run the program if need be.

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